Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 439 insertions, 0 deletions

diff --git a/gfx/graphite2/src/Silf.cpp b/gfx/graphite2/src/Silf.cpp
new file mode 100644
index 0000000000..44d3c96171
--- /dev/null
+++ b/gfx/graphite2/src/Silf.cpp
@@ -0,0 +1,439 @@
+/*  GRAPHITE2 LICENSING
+
+    Copyright 2010, SIL International
+    All rights reserved.
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published
+    by the Free Software Foundation; either version 2.1 of License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should also have received a copy of the GNU Lesser General Public
+    License along with this library in the file named "LICENSE".
+    If not, write to the Free Software Foundation, 51 Franklin Street,
+    Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
+    internet at http://www.fsf.org/licenses/lgpl.html.
+
+Alternatively, the contents of this file may be used under the terms of the
+Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
+License, as published by the Free Software Foundation, either version 2
+of the License or (at your option) any later version.
+*/
+#include <cstdlib>
+#include "graphite2/Segment.h"
+#include "inc/debug.h"
+#include "inc/Endian.h"
+#include "inc/Silf.h"
+#include "inc/Segment.h"
+#include "inc/Rule.h"
+#include "inc/Error.h"
+
+
+using namespace graphite2;
+
+namespace { static const uint32 ERROROFFSET = 0xFFFFFFFF; }
+
+Silf::Silf() throw()
+: m_passes(0),
+  m_pseudos(0),
+  m_classOffsets(0),
+  m_classData(0),
+  m_justs(0),
+  m_numPasses(0),
+  m_numJusts(0),
+  m_sPass(0),
+  m_pPass(0),
+  m_jPass(0),
+  m_bPass(0),
+  m_flags(0),
+  m_dir(0),
+  m_aPseudo(0),
+  m_aBreak(0),
+  m_aUser(0),
+  m_aBidi(0),
+  m_aMirror(0),
+  m_aPassBits(0),
+  m_iMaxComp(0),
+  m_aCollision(0),
+  m_aLig(0),
+  m_numPseudo(0),
+  m_nClass(0),
+  m_nLinear(0),
+  m_gEndLine(0)
+{
+    memset(&m_silfinfo, 0, sizeof m_silfinfo);
+}
+
+Silf::~Silf() throw()
+{
+    releaseBuffers();
+}
+
+void Silf::releaseBuffers() throw()
+{
+    delete [] m_passes;
+    delete [] m_pseudos;
+    free(m_classOffsets);
+    free(m_classData);
+    free(m_justs);
+    m_passes= 0;
+    m_pseudos = 0;
+    m_classOffsets = 0;
+    m_classData = 0;
+    m_justs = 0;
+}
+
+
+bool Silf::readGraphite(const byte * const silf_start, size_t lSilf, Face& face, uint32 version)
+{
+    const byte * p = silf_start,
+               * const silf_end = p + lSilf;
+    Error e;
+
+    if (e.test(version >= 0x00060000, E_BADSILFVERSION))
+    {
+        releaseBuffers(); return face.error(e);
+    }
+    if (version >= 0x00030000)
+    {
+        if (e.test(lSilf < 28, E_BADSIZE)) { releaseBuffers(); return face.error(e); }
+        be::skip<int32>(p);    // ruleVersion
+        be::skip<uint16>(p,2); // passOffset & pseudosOffset
+    }
+    else if (e.test(lSilf < 20, E_BADSIZE)) { releaseBuffers(); return face.error(e); }
+    const uint16 maxGlyph = be::read<uint16>(p);
+    m_silfinfo.extra_ascent = be::read<uint16>(p);
+    m_silfinfo.extra_descent = be::read<uint16>(p);
+    m_numPasses = be::read<uint8>(p);
+    m_sPass     = be::read<uint8>(p);
+    m_pPass     = be::read<uint8>(p);
+    m_jPass     = be::read<uint8>(p);
+    m_bPass     = be::read<uint8>(p);
+    m_flags     = be::read<uint8>(p);
+    be::skip<uint8>(p,2); //  max{Pre,Post}Context.
+    m_aPseudo   = be::read<uint8>(p);
+    m_aBreak    = be::read<uint8>(p);
+    m_aBidi     = be::read<uint8>(p);
+    m_aMirror   = be::read<uint8>(p);
+    m_aPassBits = be::read<uint8>(p);
+
+    // Read Justification levels.
+    m_numJusts  = be::read<uint8>(p);
+    if (e.test(maxGlyph >= face.glyphs().numGlyphs(), E_BADMAXGLYPH)
+        || e.test(p + m_numJusts * 8 >= silf_end, E_BADNUMJUSTS))
+    {
+        releaseBuffers(); return face.error(e);
+    }
+
+    if (m_numJusts)
+    {
+        m_justs = gralloc<Justinfo>(m_numJusts);
+        if (e.test(!m_justs, E_OUTOFMEM)) return face.error(e);
+
+        for (uint8 i = 0; i < m_numJusts; i++)
+        {
+            ::new(m_justs + i) Justinfo(p[0], p[1], p[2], p[3]);
+            be::skip<byte>(p,8);
+        }
+    }
+
+    if (e.test(p + sizeof(uint16) + sizeof(uint8)*8 >= silf_end, E_BADENDJUSTS)) { releaseBuffers(); return face.error(e); }
+    m_aLig       = be::read<uint16>(p);
+    m_aUser      = be::read<uint8>(p);
+    m_iMaxComp   = be::read<uint8>(p);
+    m_dir        = be::read<uint8>(p) - 1;
+    m_aCollision = be::read<uint8>(p);
+    be::skip<byte>(p,3);
+    be::skip<uint16>(p, be::read<uint8>(p));    // don't need critical features yet
+    be::skip<byte>(p);                          // reserved
+    if (e.test(p >= silf_end, E_BADCRITFEATURES))   { releaseBuffers(); return face.error(e); }
+    be::skip<uint32>(p, be::read<uint8>(p));    // don't use scriptTag array.
+    if (e.test(p + sizeof(uint16) + sizeof(uint32) >= silf_end, E_BADSCRIPTTAGS)) { releaseBuffers(); return face.error(e); }
+    m_gEndLine  = be::read<uint16>(p);          // lbGID
+    const byte * o_passes = p;
+    uint32 passes_start = be::read<uint32>(p);
+
+    const size_t num_attrs = face.glyphs().numAttrs();
+    if (e.test(m_aPseudo   >= num_attrs, E_BADAPSEUDO)
+        || e.test(m_aBreak >= num_attrs, E_BADABREAK)
+        || e.test(m_aBidi  >= num_attrs, E_BADABIDI)
+        || e.test(m_aMirror>= num_attrs, E_BADAMIRROR)
+        || e.test(m_aCollision && m_aCollision >= num_attrs - 5, E_BADACOLLISION)
+        || e.test(m_numPasses > 128, E_BADNUMPASSES) || e.test(passes_start >= lSilf, E_BADPASSESSTART)
+        || e.test(m_pPass < m_sPass, E_BADPASSBOUND) || e.test(m_pPass > m_numPasses, E_BADPPASS) || e.test(m_sPass > m_numPasses, E_BADSPASS)
+        || e.test(m_jPass < m_pPass, E_BADJPASSBOUND) || e.test(m_jPass > m_numPasses, E_BADJPASS)
+        || e.test((m_bPass != 0xFF && (m_bPass < m_jPass || m_bPass > m_numPasses)), E_BADBPASS)
+        || e.test(m_aLig > 127, E_BADALIG))
+    {
+        releaseBuffers();
+        return face.error(e);
+    }
+    be::skip<uint32>(p, m_numPasses);
+    if (e.test(unsigned(p - silf_start) + sizeof(uint16) >= passes_start, E_BADPASSESSTART)) { releaseBuffers(); return face.error(e); }
+    m_numPseudo = be::read<uint16>(p);
+    be::skip<uint16>(p, 3); // searchPseudo, pseudoSelector, pseudoShift
+    m_pseudos = new Pseudo[m_numPseudo];
+    if (e.test(unsigned(p - silf_start) + m_numPseudo*(sizeof(uint32) + sizeof(uint16)) >= passes_start, E_BADNUMPSEUDO)
+        || e.test(!m_pseudos, E_OUTOFMEM))
+    {
+        releaseBuffers(); return face.error(e);
+    }
+    for (int i = 0; i < m_numPseudo; i++)
+    {
+        m_pseudos[i].uid = be::read<uint32>(p);
+        m_pseudos[i].gid = be::read<uint16>(p);
+    }
+
+    const size_t clen = readClassMap(p, passes_start + silf_start - p, version, e);
+    m_passes = new Pass[m_numPasses];
+    if (e || e.test(clen > unsigned(passes_start + silf_start - p), E_BADPASSESSTART)
+          || e.test(!m_passes, E_OUTOFMEM))
+    { releaseBuffers(); return face.error(e); }
+
+    for (size_t i = 0; i < m_numPasses; ++i)
+    {
+        uint32 pass_start = be::read<uint32>(o_passes);
+        uint32 pass_end = be::peek<uint32>(o_passes);
+        face.error_context((face.error_context() & 0xFF00) + EC_ASILF + unsigned(i << 16));
+        if (e.test(pass_start > pass_end, E_BADPASSSTART)
+                || e.test(pass_start < passes_start, E_BADPASSSTART)
+                || e.test(pass_end > lSilf, E_BADPASSEND)) {
+            releaseBuffers(); return face.error(e);
+        }
+
+        enum passtype pt = PASS_TYPE_UNKNOWN;
+        if (i >= m_jPass) pt = PASS_TYPE_JUSTIFICATION;
+        else if (i >= m_pPass) pt = PASS_TYPE_POSITIONING;
+        else if (i >= m_sPass) pt = PASS_TYPE_SUBSTITUTE;
+        else pt = PASS_TYPE_LINEBREAK;
+
+        m_passes[i].init(this);
+        if (!m_passes[i].readPass(silf_start + pass_start, pass_end - pass_start, pass_start, face, pt,
+            version, e))
+        {
+            releaseBuffers();
+            return false;
+        }
+    }
+
+    // fill in gr_faceinfo
+    m_silfinfo.upem = face.glyphs().unitsPerEm();
+    m_silfinfo.has_bidi_pass = (m_bPass != 0xFF);
+    m_silfinfo.justifies = (m_numJusts != 0) || (m_jPass < m_pPass);
+    m_silfinfo.line_ends = (m_flags & 1);
+    m_silfinfo.space_contextuals = gr_faceinfo::gr_space_contextuals((m_flags >> 2) & 0x7);
+    return true;
+}
+
+template<typename T> inline uint32 Silf::readClassOffsets(const byte *&p, size_t data_len, Error &e)
+{
+    const T cls_off = 2*sizeof(uint16) + sizeof(T)*(m_nClass+1);
+    const uint32 max_off = (be::peek<T>(p + sizeof(T)*m_nClass) - cls_off)/sizeof(uint16);
+    // Check that the last+1 offset is less than or equal to the class map length.
+    if (e.test(be::peek<T>(p) != cls_off, E_MISALIGNEDCLASSES)
+            || e.test(max_off > (data_len - cls_off)/sizeof(uint16), E_HIGHCLASSOFFSET))
+        return ERROROFFSET;
+
+    // Read in all the offsets.
+    m_classOffsets = gralloc<uint32>(m_nClass+1);
+    if (e.test(!m_classOffsets, E_OUTOFMEM)) return ERROROFFSET;
+    for (uint32 * o = m_classOffsets, * const o_end = o + m_nClass + 1; o != o_end; ++o)
+    {
+        *o = (be::read<T>(p) - cls_off)/sizeof(uint16);
+        if (e.test(*o > max_off, E_HIGHCLASSOFFSET))
+            return ERROROFFSET;
+    }
+    return max_off;
+}
+
+size_t Silf::readClassMap(const byte *p, size_t data_len, uint32 version, Error &e)
+{
+    if (e.test(data_len < sizeof(uint16)*2, E_BADCLASSSIZE)) return ERROROFFSET;
+
+    m_nClass  = be::read<uint16>(p);
+    m_nLinear = be::read<uint16>(p);
+
+    // Check that numLinear < numClass,
+    // that there is at least enough data for numClasses offsets.
+    if (e.test(m_nLinear > m_nClass, E_TOOMANYLINEAR)
+     || e.test((m_nClass + 1) * (version >= 0x00040000 ? sizeof(uint32) : sizeof(uint16)) > (data_len - 4), E_CLASSESTOOBIG))
+        return ERROROFFSET;
+
+    uint32 max_off;
+    if (version >= 0x00040000)
+        max_off = readClassOffsets<uint32>(p, data_len, e);
+    else
+        max_off = readClassOffsets<uint16>(p, data_len, e);
+
+    if (max_off == ERROROFFSET) return ERROROFFSET;
+
+    if (e.test((int)max_off < m_nLinear + (m_nClass - m_nLinear) * 6, E_CLASSESTOOBIG))
+        return ERROROFFSET;
+
+    // Check the linear offsets are sane, these must be monotonically increasing.
+    assert(m_nClass >= m_nLinear);
+    for (const uint32 *o = m_classOffsets, * const o_end = o + m_nLinear; o != o_end; ++o)
+        if (e.test(o[0] > o[1], E_BADCLASSOFFSET))
+            return ERROROFFSET;
+
+    // Fortunately the class data is all uint16s so we can decode these now
+    m_classData = gralloc<uint16>(max_off);
+    if (e.test(!m_classData, E_OUTOFMEM)) return ERROROFFSET;
+    for (uint16 *d = m_classData, * const d_end = d + max_off; d != d_end; ++d)
+        *d = be::read<uint16>(p);
+
+    // Check the lookup class invariants for each non-linear class
+    for (const uint32 *o = m_classOffsets + m_nLinear, * const o_end = m_classOffsets + m_nClass; o != o_end; ++o)
+    {
+        const uint16 * lookup = m_classData + *o;
+        if (e.test(*o + 4 > max_off, E_HIGHCLASSOFFSET)                        // LookupClass doesn't stretch over max_off
+         || e.test(lookup[0] == 0                                                   // A LookupClass with no looks is a suspicious thing ...
+                    || lookup[0] * 2 + *o + 4 > max_off                             // numIDs lookup pairs fits within (start of LookupClass' lookups array, max_off]
+                    || lookup[3] + lookup[1] != lookup[0], E_BADCLASSLOOKUPINFO)    // rangeShift:   numIDs  - searchRange
+         || e.test(((o[1] - *o) & 1) != 0, ERROROFFSET))                         // glyphs are in pairs so difference must be even.
+            return ERROROFFSET;
+    }
+
+    return max_off;
+}
+
+uint16 Silf::findPseudo(uint32 uid) const
+{
+    for (int i = 0; i < m_numPseudo; i++)
+        if (m_pseudos[i].uid == uid) return m_pseudos[i].gid;
+    return 0;
+}
+
+uint16 Silf::findClassIndex(uint16 cid, uint16 gid) const
+{
+    if (cid > m_nClass) return -1;
+
+    const uint16 * cls = m_classData + m_classOffsets[cid];
+    if (cid < m_nLinear)        // output class being used for input, shouldn't happen
+    {
+        for (unsigned int i = 0, n = m_classOffsets[cid + 1] - m_classOffsets[cid]; i < n; ++i, ++cls)
+            if (*cls == gid) return i;
+        return -1;
+    }
+    else
+    {
+        const uint16 *  min = cls + 4,      // lookups array
+                     *  max = min + cls[0]*2; // lookups aray is numIDs (cls[0]) uint16 pairs long
+        do
+        {
+            const uint16 * p = min + (-2 & ((max-min)/2));
+            if  (p[0] > gid)    max = p;
+            else                min = p;
+        }
+        while (max - min > 2);
+        return min[0] == gid ? min[1] : -1;
+    }
+}
+
+uint16 Silf::getClassGlyph(uint16 cid, unsigned int index) const
+{
+    if (cid > m_nClass) return 0;
+
+    uint32 loc = m_classOffsets[cid];
+    if (cid < m_nLinear)
+    {
+        if (index < m_classOffsets[cid + 1] - loc)
+            return m_classData[index + loc];
+    }
+    else        // input class being used for output. Shouldn't happen
+    {
+        for (unsigned int i = loc + 4; i < m_classOffsets[cid + 1]; i += 2)
+            if (m_classData[i + 1] == index) return m_classData[i];
+    }
+    return 0;
+}
+
+
+bool Silf::runGraphite(Segment *seg, uint8 firstPass, uint8 lastPass, int dobidi) const
+{
+    assert(seg != 0);
+    size_t             maxSize = seg->slotCount() * MAX_SEG_GROWTH_FACTOR;
+    SlotMap            map(*seg, m_dir, maxSize);
+    FiniteStateMachine fsm(map, seg->getFace()->logger());
+    vm::Machine        m(map);
+    uint8              lbidi = m_bPass;
+#if !defined GRAPHITE2_NTRACING
+    json * const dbgout = seg->getFace()->logger();
+#endif
+
+    if (lastPass == 0)
+    {
+        if (firstPass == lastPass && lbidi == 0xFF)
+            return true;
+        lastPass = m_numPasses;
+    }
+    if ((firstPass < lbidi || (dobidi && firstPass == lbidi)) && (lastPass >= lbidi || (dobidi && lastPass + 1 == lbidi)))
+        lastPass++;
+    else
+        lbidi = 0xFF;
+
+    for (size_t i = firstPass; i < lastPass; ++i)
+    {
+        // bidi and mirroring
+        if (i == lbidi)
+        {
+#if !defined GRAPHITE2_NTRACING
+            if (dbgout)
+            {
+                *dbgout << json::item << json::object
+//							<< "pindex" << i   // for debugging
+                            << "id"     << -1
+                            << "slotsdir" << (seg->currdir() ? "rtl" : "ltr")
+                            << "passdir" << (m_dir & 1 ? "rtl" : "ltr")
+                            << "slots"  << json::array;
+                seg->positionSlots(0, 0, 0, seg->currdir());
+                for(Slot * s = seg->first(); s; s = s->next())
+                    *dbgout     << dslot(seg, s);
+                *dbgout         << json::close
+                            << "rules"  << json::array << json::close
+                            << json::close;
+            }
+#endif
+            if (seg->currdir() != (m_dir & 1))
+                seg->reverseSlots();
+            if (m_aMirror && (seg->dir() & 3) == 3)
+                seg->doMirror(m_aMirror);
+        --i;
+        lbidi = lastPass;
+        --lastPass;
+        continue;
+        }
+
+#if !defined GRAPHITE2_NTRACING
+        if (dbgout)
+        {
+            *dbgout << json::item << json::object
+//						<< "pindex" << i   // for debugging
+                        << "id"     << i+1
+                        << "slotsdir" << (seg->currdir() ? "rtl" : "ltr")
+                        << "passdir" << ((m_dir & 1) ^ m_passes[i].reverseDir() ? "rtl" : "ltr")
+                        << "slots"  << json::array;
+            seg->positionSlots(0, 0, 0, seg->currdir());
+            for(Slot * s = seg->first(); s; s = s->next())
+                *dbgout     << dslot(seg, s);
+            *dbgout         << json::close;
+        }
+#endif
+
+        // test whether to reorder, prepare for positioning
+        bool reverse = (lbidi == 0xFF) && (seg->currdir() != ((m_dir & 1) ^ m_passes[i].reverseDir()));
+        if ((i >= 32 || (seg->passBits() & (1 << i)) == 0 || m_passes[i].collisionLoops())
+                && !m_passes[i].runGraphite(m, fsm, reverse))
+            return false;
+        // only subsitution passes can change segment length, cached subsegments are short for their text
+        if (m.status() != vm::Machine::finished
+            || (seg->slotCount() && seg->slotCount() > maxSize))
+            return false;
+    }
+    return true;
+}